bipyramid(dipyramid)

所属栏目：矿物学专业术语

Definition: An n-gonal bipyramid or dipyramid is a polyhedron formed by joining an ngonal pyramid and its mirror image base-to-base. The referenced n-gon in the name of thebipyramids is not an external face but an internal one,existing on the primary symm ......（本文共 736 字 ）     [阅读本文] >>


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